Building a "Universal" (fat) binary on Mac OS X requires passing some 
extra arguments to the compiler and linker. Apple recommends setting 
them as CFLAGS and LDFLAGS, and this does the trick for software which 
respects those variables.

The following diff makes devel/bmake respect CFLAGS passed in the 
environment, which lets me build and run a Universal binary of bmake. Is 
this OK to commit?

http://netbsd.schmonz.com/patches/bmake.diff